REST APIs for FDMEE and Cloud Data Management allow external clients to execute jobs like rules, batches, and reports from the cloud or on-premises. The APIs use common standards like HTTP requests and JSON payloads to trigger processes via URL endpoints. Developers can leverage the APIs in various technologies like Excel, PowerShell, RPA tools, and mobile apps to automate tasks and integrate FDMEE/CDM with other systems. While some APIs are publicly documented, others can be discovered and provide more advanced capabilities around refreshing metadata, importing/exporting data, and custom script execution.